Lining Code: NFPA 211.14.9
If the flue liner in a chimney has softened, cracked or otherwise deteriorated so that it no longer has the continued ability to contain the products of combustion (I.E. heat, moisture, creosote & flue gases), the liner shall be removed & replaced, repaired, or relined with a listed liner system.
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Upon your recommendation I recently had my oil burner chimney repaired/replaced by Guaranteed Chimney. They increased the size of the flue to seven inches from four inches. The negative draft is now five.
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